Update deprecated ms.topic values to concept-article

[wadepickett]

Replacing old depricated ms.topic values with the required new ones.

---

Internal previews

📄 File	🔗 Preview link
docs/ai/agent-framework.md	docs/ai/agent-framework
docs/ai/chat.md	docs/ai/chat
docs/ai/embeddings.md	docs/ai/embeddings
docs/ai/getting-started.md	docs/ai/getting-started
docs/ai/requirements-apple.md	docs/ai/requirements-apple

[learn-build-service-prod]

Learn Build status updates of commit ad5d838:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/ai/agent-framework.md	✅Succeeded	View (>=net-maui-8.0)
docs/ai/chat.md	✅Succeeded	View (>=net-maui-8.0)
docs/ai/embeddings.md	✅Succeeded	View (>=net-maui-8.0)
docs/ai/getting-started.md	✅Succeeded	View (>=net-maui-8.0)
docs/ai/requirements-apple.md	✅Succeeded	View (>=net-maui-8.0)
docs/docfx.json	✅Succeeded

For more details, please refer to the build report.

[wadepickett]

@adegeo for review. Thanks.

[learn-build-service-prod]

PoliCheck Scan Report

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